My first Orange Chiffon Cake

Ingredients (I reduce portion to using 2 eggs for 6 inch tin)
7 egg yolks (I use 2)
50g caster sugar (I use 15g)
1/4 tsp salt (I omit)
4 tbsp cooking oil (I use 20ml)
2 tbsp grated orange rind (I grate 1 orange)
60ml orange juice (I use 20ml)
few drops orange colouring (I omit)
110g self raising flour (I use 35g)
7 egg whites (I use 2)
1/2 tsp cream of tartar (I use 1/4 tsp)
130g caster sugar (I use 40g)

Method
1. Combine egg yolks, salt, sugar and beat until pale in colour. Add cooking oil,
grated orange rind, orange juice and colouring and mix well.
2. Fold in flour until batter forms.
3. Whisk egg whites and cream of tartar until frothy. Add in sugar gradually in 3
portions until stiff peaks form.
4. Gently fold in egg white mixture into the egg yolk mixture, 1/3 at a time.
5. Pour mixture into ungreased 9 inch tube pan and bake at 170C for 30-40 mins.
6. Remove from oven and quickly turn the chiffon cake upside down on a wire rack.
7. Wait for the cake to cool completely before removing it from the tin.